Hi,

I have been working on support for AHCI controller for my ARMv8 platform.

For that I have integrated my PciEmulation code and SataControllerDxe driver code with MdeModulePkg/Bus/Ata.

But facing one issue, this is same issue reported by Jan Dabros(in To list) sometime back.

Setting PxCMD.FRE bit of command register doesn't cause PxCMD.FR to be set to ‘1’ even after “500msec” timeout.

(As per AHCI spec 1.3 : When PxCMD.FRE is set, it causes PxCMD.FR to be set to ‘1’ )

Is it correct to just comment out following code part from “MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c” file, “AhciModeInitialization” function:

As Initialization timeouts is occurring in below part of code:

      //

      // Enable FIS Receive DMA engine for the first D2H FIS.

      //

      Offset = EFI_AHCI_PORT_START + Port * EFI_AHCI_PORT_REG_WIDTH + EFI_AHCI_PORT_CMD;

      AhciOrReg (PciIo, Offset, EFI_AHCI_PORT_CMD_FRE);

      Status = AhciWaitMmioSet (

                 PciIo,

                 Offset,

                 EFI_AHCI_PORT_CMD_FR,

                 EFI_AHCI_PORT_CMD_FR,

                 EFI_AHCI_PORT_CMD_FR_CLEAR_TIMEOUT

                 );

      if (EFI_ERROR (Status)) {

        continue;

      }

And if above code is commented out, then SATA stack works completely fine.

What can be the problem?

Thank you in advance for your time!

Best regards,

Shaveta